Look like

You can say "He looked about 17" to mean "He looked like he was about 17," but not "He looked like 17."

Understand the difference between look and look like!
Thank you, GG.

Good. So are you ready to tackle "He looked like death warmed over"?

Oh, It's a difficult one for me now.
I think technically death should be Death, but it's decapitalized as a fixed

Oh,now I think:
death is a noun meaning death and warmed over is an adjectival phrase modifying death, right?
Cambridge says "warm sth over" means to use an idea that has been used before, but I don't understand why "death wamed over" means what my EJ dictionary says.

Imagine how a dead person would look if he came back to life after being dead a bit. Pretty ghastly, yeah?

So it just means the person looks really, really sick/ill/tired/etc.

Aha! Understand!
Thank you, GG.